12157690 has 8 divisors (see below), whose sum is σ = 21883860. Its totient is φ = 4863072.

The previous prime is 12157679. The next prime is 12157693. The reversal of 12157690 is 9675121.

It can be written as a sum of positive squares in 2 ways, for example, as 11135569 + 1022121 = 3337^2 + 1011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12157690² = 295618852272200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12157693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607875 + ... + 607894.

Almost surely, 2^12157690 is an apocalyptic number.

12157690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12157690 is a deficient number, since it is larger than the sum of its proper divisors (9726170).

12157690 is a wasteful number, since it uses less digits than its factorization.

12157690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215776.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 12157690 is about 3486.7879201351. The cubic root of 12157690 is about 229.9413208845.

The spelling of 12157690 in words is "twelve million, one hundred fifty-seven thousand, six hundred ninety".